In my application users can login using the social networks such as facebook, twitter, linkedin so can any one tell me how to check whether user is already logged in with the facebook/twitter/linkedin in Phone with browser or other internal Apps, My application should also be able to know that the user has logged in so that it should not ask again for the login screen, Even if the user logged in using web browser/Facebook internal App my application should be able to access those credentials and it should allow users to login with out asking for the credentials again.
How to do this.
Thank you for all hints and your help in advance!